Apparatus for rolling disks



C. S. SHUMAKER APPARATUS FOR ROLLING DISKS June 8,' 1965 5 Sheets-Sheet1 Original Filed May 18, 1959 llLlllll nu llL mm hm 6w CHARLES S. SHUMAKER BY 34 Q figs; HIS ATTORNEY June 8, 1965 c. s. SHUMAKER APPARATUS FORROLLING DISKS 5 Sheets-Sheet 2 Original Filed May 18, 1959 IN VEN TOR.CHARLES S. SHUMAKER HIS ATTORNEY June 8, 1965 c. s. SHUMAKER APPARATUSFOR ROLLING DISKS Original Filed May 18, 1959 5 Sheets-Sheet 3 nmw INVEN TOR. CHARLES S. SHUMA KER WM MAA 7 Q 7704;; HIS ATTORNEY June 8,1965 c. s. SHUMAKER APPARATUS FOR ROLLING DISKS 5 Sheets-Sheet 4Original Filed May 18, 1959 w wE HIS A TORNEY June 8, 1965 c. s.SHUMAKER APPARATUS FOR ROLLING DISKS Original Filed May 18, 1959 sSheets-Sheet 5 FAVE INVENTOR. CHARLES $.SHUMAKER 7L & M

HIS A TT RNEY United States Patent 3,187,535 APPARATUS FOR ROLLING DISKSCharles Storer Shumaker, Glenshaw, Pa., assignor, by mesne assignments,to Kelsey-Hayes Company, Romulus, Mich., a corporation of DelawareOriginal appiication May 18, 1959, Ser. No. 813,812, now Patent No.3,090,265, dated May 21, 1963. Divided and this application Nov. 21,1962, Ser. No. 229,776 7 Claims. (Cl. 7284) try with respect to theproduction of disks having a given contour, attained by heating theblanks to a sufliciently high temperature to permit them to be readilyrolled into the shape desired. Disks produced by hot rolling, however,do not possess metallugical properties necessary to meet criticalrequirement as are presently de manded. A number of methods andapparatuses, also, have been developed in recent years for the coldrolling or spinning of contoured disks, but none of them have beenconsistently able to produce disks which are wholly acceptable in allevents with respect to smoothness of finish or adaptability of beingdrawn directly.

One of the objects of the present invention is to provide a method andapparatus for forming contoured disks in a highly efficient andeconomical manner.

Another object of this invention is to provide for simultaneouslyforming a pair of variable thickness disks from a pair of constantthickness circular blanks by employing two pairs of cooperating reducingrolls, the reducing action of which is so controlled that disks ofaccurate pre-determined desire-d contours are assured.

A further object of this invention is to provide a method and apparatusfor forming disks in which two pairs of opposed cooperating rolls havinga given contour are diametrically arranged and brought into a rollingrelationship with a pair of blank disks positioned in a back to backrelationship, the pairs of rolls being movable simultaneously in anaxial outward direction.

It is a further object of this invention to provide a method ofsimultaneously forming contoured disks from a pair of blanks of uniformthickness in which the blanks are reduced from their inner areas outwardby rolls having predetermined contoured portions, the leading portion ofeach roll being arranged to immediately precede the portion of the rollemployed for reducing by rolling and adapted to restrain the unrolledmetal thereby to cause a reduction by elongation prior to being engagedby the reducing portions of the rolls.

It is another object of this invention to provide a method of formingcontoured disks in which a pair of superposed disk blanks aresimultaneously reduced to a predetermined controlled contour by engagingthe inner areas of the disks simultaneously and performing a rollingoperation thereon by pairs of cooperating contour shaping and reducingrolls and engaging the outer peripheral areas of the disks immediatelyahead of the reduced rolled areas to restrain the outer peripheral areasin a manner to cause the outer peripheral areas to be reduced byelongation prior to being engaged by the reducing rolling portions ofthe rolls, and engaging the areas of the disks subsequent to rolling toburnish the area thus rolled.

roll.

3,187,535 Patented June 8, 1965 It is a still further object of thisinvention to provide a method for producing uniformly tapered disks fromblanks of uniform thickness positioned in back to back relationship inwhich two pairs of rolls are employed, one pair of which is invertedwith respect to the other and each pair including a forming roll and ananvil roll.

It is another object of this invention to provide a roll adapted toproduce a disk of a given contour from a disk having a substantiallyuniform thickness including a rolling portion for reducing the disk, aburnishing portion adapted to burnish the rolled portion of the disk anda confining portion adapted to confine and to -reduce a portion of thedisk in advance of the portion reduced by rolling.

It is a still further object of the invention to provide a cooperatingpair of tapered disk rolling rolls in which one roll is an anvil rolland the other roll is a forming These objects as well as the variousother novel features and advantages of this invention will becomeapparent from the following description and accompanying drawings ofwhich:

FIGURE 1 is a plan view of a disk forming mill in which the novel rollsas disclosed herein are incorporated and the operation of the method ofproducing disks as defined herein may be practiced;

FIGURE 2 is a front elevational view of the disk forming mill showninFIGURE 1;

FIGURE 3 is a partial sectional elevational side view taken at linesIIIIH of FIGURE 1;

FIGURE 4 is a sectional elevational end view taken at lines IV1V ofFIGURE 3;

FIGURE 5 is an enlarged view of a portion of one pair of reducingrollsshown in FIGURE 2 in which three positions taken by the rolls areindicated as a pair of blanks is traversed during a disk formingoperation;

V FIGURE 6 is an enlarged view of portions of two pairs of modified diskforming rolls showing the rolls in engagement with a pair of blanksduring a forming operation, and V.

. FIGURE 7 is an enlarged view of a portion of one pair of rolls furthermodified to incorporate some of the features of the rolls shown in bothFIGURES 5 and 6.

With reference to FIGURES 1 and 2, there is illustrated therein a millfor forming disks which embodies the features of the invention hereindisclosed incorporating a rigidly constructed unitary housing 11 havingT-shaped postsections 12 formed on the outside surfaces of two of theopposite sides thereof. The lower ends of two sides of the housingterminate into pairs of spaced apart outwardly extending shoes 13 whichrest upon individual parallel disposed bedplates 14, the bedplates beingof sufficient length to extend beyond the ends of the housing and beingsupported on suitable foundations provided for the purpose. Windows 15are formed in the housing and centrally located in the opposite twosides thereof which are surrounded by the T-shaped sections 12. Inaddition, windows 16 are also provided in the remaining opposite. sidesof the housing so that the configuration .of the housing constitutesfour vertical rigid posts joined together by thick top and bottomsections to form on integral unit. a

With reference now to FIGURES 3 and 4, it will be appreciated that theelements illustrated therein having identifying numerals including thelower case letter b are identical to and symmetrically arranged withrespect to other elements contained in the left hand portion of the millas shown in FIGURES 1 and 2. Where the elements of the left hand portionof the mill are identified, lower case letter a is included with thenumerals.

In the upper and lower extremities of the housing 11 extendinghorizontally through the windows 15, lower and being arranged in aninverted position with respect to cross-head 17, as best shown in FIGURE4.

The four inside flat surfaces of the web portions of the channel shapedcross-heads 17 and 18 that extend within the windows are provided with araised central portion having centrally located grooves or guides 22into which there are received complementary projecting portions of twopairs of corresponding wedges 23b and 2412. These wedges are supportedalong their entire length within the housing and the width thereofcorresponds to the width of the raised central portions of thecross-heads and are so arranged that the narrow ends thereof will extendtowards the vertical centerline of the mill. The lower wedge element23!), as shown in FIG- URE 4, isprevented from moving longitudinally bykey 25 which is positioned in transversely arranged keyways provided inboth. the wedge and lower cross-head. The upper wedge 24b, in contrastto the wedge 23b, is permitted to move in a horizontal direction in theguides 22 within the cross-head. 'This horizontal movement isaccomplished by an individual high pressure piston cylinder assembly 26bconnected to the outboard end of the wedge and secured to and supportedby a sliding casting 27b. Each of the wedges 23b and 24b have acentrally located groove 28 provided on the inclined surface thereofinto which there is received a complementary projection provided on theinclined surfaces of other wedges 31b and 32b respectively which, thoughof the same width as the wedges 23b and 24b, are somewhat greater inlength. The ends of the wedges 31b and 32b which extend away from themill are connected to individual high pressure piston cylinder asemblies33b and 34b respectively by which the wedges are moved horizontally toeffect vertical displacement of the rolls. The piston cylinder assem'blies 33b and 3411, as shown in FIGURE 3, are mounted on suitabletrunnions on extended portions of the crossheads so asto permit thepiston cylinder assemblies to pivot during operation.

Engaged with the horizontal flat surfaces of wedges 31b and 32b thereare two cam holders 35b and 36b, the lower holders 3512, as best shownin FIGURE 4, being inverted with respect to holder 36b. The holders arerestrained from moving transversely and longitudinally by suitablevertical guide surfaces provided on the cross-heads. By thisconstruction, the cam holders are permitted to move vertically only.Into the open sides of the holders 35b and 36b, wedge shaped cams 37band 38b respectivelyare received, these cams being shorter in lengththan the opening in the holders in order to facilitate ease of assembly.

Extending between the pairs of'cams 37b and 38b and arranged in the samevertical plane, also as shown in FIG- URE 3, there are located in eachwindow 15 one pair of individual chock assemblies 39b and 41b, thechocks being arranged on opposite sides of the horizontal centerline ofthe mill.

The chocks are made in the form of hollow tubular'castings, the inboardends being in the form of heavy rectangular sections having straightvertical sides corresponding to the sides of the housing post as bestseen in FIGURE 4.

Each of the chocks incorporate spaced apart roller FIGURE 3, that thecam rollers 47b and 4 b are adapted to rest on and travel over the cams37b and 38b, the cams being made sufficiently long to provide suflicientbackingup support for the cam rollers during a disk forming operation.

At the outboard ends of each chock 39b and 411; there are two extensions51b and the extensions of the two chocks 39b and 41b are pivotallyconnected together by a pin 52b secured to spindle support stand 53barranged at the ends of the shafts 44b and 45b. The axis of the pivotestablishes the horizontal pass line or centerline of the mill. Thispivotal arrangement permits the chocks to be moved toward and away fromeach other. A pair of piston cylinder assemblies 54b is arranged at theroll end of the lower chock assembly 3%, as best shown in FIGURE 4, withthe ends of the pistons thereof engaged with the lower surfaces of theupper chock assembly-41b and by which means the top chocks are supportedand the cam rollers 47b and 4%!) held against the cams 37b and 33respectively. The spindle stand 53b is arranged between the outer endsof the shafts 41b and 45b and the motor 55b, as best shown in FIGURES 1and 2, the stands supporting the pivoted outboard ends of chocks 39b and41b.

bearings 42 and.43 which rotatably support longitudinally extendingshafts 44b and 45b. The bearings 42 are of heavy duty type, as indicatedin FIGURE 3,v in order to support adequately the overhanging loadimposed during rolling upon the inboard ends of the shafts. In thevertical plane containing the large bearings 42 and on the sides of thechocks farthest away from the horizontal centerline of the mill, thechocks are verticallyextended and in the extended portions thereofannular recesses are provided for receiving bearings 46 which rotatablysupport the journals of cam rollers or, followers 47b and 48b. The axesof the cam rollers 47b and 4811 are arranged at The outer ends of theshafts 44b and 4512 are connected by suitable spindles 56b and 57b tothe output side of a common gear drive 58b. To the input shaft of thegear drive there is connected a motor 55b.

To the enlarged inboard ends of shafts 44b and 45b, which extend beyondthe ends of the chocks 39b and 41b, as shown in FIGURE 3, there areafiixed by means of suitable countersunk bolts 59 two cooperating largediameter relatively narrow width contour forming rolls 61b and 62b. Thecontours of the rolls are so defined as to serve certain functionsduring a disk forming operation including rolling, confining orrestraining and 'burnishing, the details concerning which will be morefully discussed hereinafter.

Similar platforms 63a and 6312 are provided on each side of the mill, asshown in FIGURES l and 2, and to which there are secured respectivelyspindle stands 53a and 53b, gear drives 58a and 58b and motors 55a and55b. The platforms 63a and 6312 are mounted for longitudinal slidablemovement uponsuitable guides 64a and s4!) re spectively as shown inFIGURE 1, aifixed to sub-platforms dSa and 6512. To the sub-platform 65athere is attached a double acting extended long stroke piston cylinderassembly 66, the piston rod 67 of which extends in a direction away fromthe mill andsecured by a bracket 68 to the outer end of the platform63a. Beneath the platform 63;: and secured to a bracket 6? which extendsdownward from platform 63a, there is attached an equalizer tension rod'71 which passes beneath the mill in a direction toward the otherplatform 65b. Secured to the other end of the rod '71 there is a rack72, see FIGURE 2, the teeth of which are formed on the upper sidesthereof. Rotatably secured to the lower portion of the sub-platform6512, there is a roller 73 which acts to guide and support the rack '72as it is moved longitudinally. Engaged with the teeth of the rack 72there is a large pinion 74 which is also rotatably secured to thesub-platform 65b. Beneath the platform 63b there is also a rack 75, theteeth of which are on the lower side thereof and in mesh with' the teethof the pinion 74. Thus, by this equalizing'arrangement, when theplatform 63a is moved outward to the left on actuation of the piston rod67, the platform 63b will also be moved outward for the same distancebut in a direction to the right.

With reference to FIGURES 3 and 6 there is shown therein the spindleassembly 76 provided for supporting the disks prior to and afterreduction of the blanks and also a holddown assembly 77 for engaging thedisks from above during the reducing operation. The holddown as semblyis connected to and raised and lowered by a piston cylinder assembly 78located at the upper portion of the mill.

Suitable loading and unloading devices 79 and 81 respectively are shownwith the mill in FIGURE 1. The loading device 79 is so devised as toreceive a pair of blank disks and place them upon the spindle assembly76 for carrying out a reducing operation and the unloader 81 is operableto engage with the same pair of disks following a reducing operation forremoving the finished product from the mill.

It will be apparent from the aforesaid description of the majorcomponent elements of the mill that the mill rolls 61b and 6211 will bebrought into and out of the rolling position by operation of thecylinders 33b and 34b to thereby move the wedges 31b and 32b. Thedesired initial roll opening is obtained by operating the cylinder 26bto move the wedge 24b to a position corresponding to the desired initialroll opening. Once this is effected, the rolls 61b and 62b as they aretraversed will be displaced by the cam rollers 47b and 48b passing overthe cams 37b and 38b.

With reference to FIGURE 3, it will be observed that the reducing rolls,of which but the right hand pair 61b and 62b is shown, are of suchdimensions that they are relatively narrow in comparison with thediameters thereof. The roll contour is considered to be of utmostimportance for successful high production operation of the mill. It isnot merely sufficient to provide rolls which reduce the blanks to obtainthe proper contour or taper desired, but the rolls must be of such ashape as to permit rapid withdrawal generally in radial direction acrossthe disks for purposes of high production, but the rolls must also becapable of producing a smooth rolled surface while at the same timeavoiding excessive workhardening and splitting of the peripheral edgesof the rolled disks.

The particular contours of the rolls employed in FIG- URE 3 are shown ingreater detail in the sequence diagram FIGURE which illustrates three ofthe positions taken by the rolls as a pair of blanks is traversedradially during a disk forming operation. Three particular positions ofthe rolls during a rolling sequence are indicated at R R R 12 and R Rand the rolls in these respective positions are shown by dotted lines,full lines and dot and dash lines respectively. With reference toposition R R the rolls are divided into a burnishing portion a-b,reducing rolling portion b-c, relieved portion cd, and lead-in portiond-e-f. The portion 11-11 is formed on the same or a slightly greaterangle than that of the taper to be formed on the disks. Of course, asrolling commences the angle to be employed for the burnishing portion ofthe rolls will depend considerably upon the characteristics of the millsuch as the deflection of roll shafts, angular opening and closing ofthe rolls, in order to assure the operator that the burnishing-portionof the roll will remain at the proper angle during the reducingoperation. The reducing portion of the rolls b-c provides for carryingout the actual reduction by rolling of the disks being for-med. Adjacentto this portion there is a relieved area c-d which serves to concentratethe rolling action to the portion b-c. The lead-in portion d-e-f isdivided into two subportions d-e being the part which serves to confinethe edges of the disks in order to attain one of the advantages of thisinvention and 2-3 a portion which prevents undue curling of the disks.The edge portions of the disks as indicated within the area d-e havealready been somewhat reduced but not by actual rolling since thatportion of the disks has not as yet been contacted by the rollingportion b-c of the rolls. If it were not for the restraining orconfining action of the roll portions d-e, the edges of the disks wouldcurl so that the disks at that point would be ruffled or dish shaped.However, the portion d-e, serving to prevent curling, actually causesthe radial compressive forces incidentto the rolling action to so actupon the disks that the portions of the disks within the d-e portion ofthe rolls is reduced by elongation. The disks are further reduced bywithdrawing the rolls radially from the position R R to the position R Rat which point the rolls are opened up and withdrawn beyond the edges ofthe disks for permitting ready removal of the finished tapered disksfrom the mill. It is to be noted that this invention provides forreducing disks to the proper dimensions without actually rolling thedisks to the very edge. The unrolled edge portions of the disks will betrimmed off prior to being processed in subsequent operations.

The degree of taper, the angle of the restraining portion and thelength-of the lead-in portion of the rolls will de pend upon thedimension of the blanks inasmuch as the taper is influenced by the biteangle of the rolls which angle is to be maintained small in order topermit a rapid withdrawal of the rolls to complete a reducing operation.The angle of the restraining surface is influenced by the thickness ofthe blanks and the length of the restraining surface is influenced byboth the thickness of the blanks and by the original and finisheddiameters of the disks.

By reason of the fact that there is an actual reduction of a portion ofthe metal prior to actual contact with the rolling reducing portions ofthe rolls, the entry of the metal into the bite of the rolls will bequite gradual resulting in a smooth gentle rolling action which wouldnot be the case if the disks were not restrained and were permitted tocurl to their fullest extent during rolling. Since this relationship ismaintained throughout the rolling cycle, as the blanks are progressivelyreduced in thickness by an actual rolling action,- there is acorresponding progressive reduction in thickness of the metal outboardof the area being rolled which, as explained heretofore, results fromelongation due to the restraining action of the rolls. Where the edgesof the disks are rolled as in present day practice, hardness has beenfound to be as high as 110 Rockwell B whereas the hardness of disksproduced by the method disclosed herein has been found to be of theorder of Rockwell B. With respect to the burnishing action, this, ofcourse, takes place immediately after reduction by rolling, theburnishing portion of the roll serving not only to burnish but to act asa support for the rolls so as to prevent the reducing portion of theroll from actually pinching the disks at the edge which obviously wouldresult in non-acceptable disks.

. A modified form of reducing rolls which may be employed in the mill isas shown in FIGURE 6 of which there are two pairs of rolls, each pairconsisting of a reducing roll 82a and 82b and anvil rolls 83a and 8311.As will be noted, the two pairs of rolls are inverted relative to eachother so that reduction of the upper disk can be independentlycontrolled by the left hand pair of rolls 82a and-83a and reduction ofthe lower disk by the right hand pair of rolls 82b and 83b. The reducingrolls 82a and 82b make contact with the disks for a distance designatedbetween the points X-Y whereas the anvil rolls make contact with thedisks for a greater distance as designated by the points X-Z. By thisarrangement, it is possible to control the rolling operation so that thedisks after being reduced are of the same cross-section, that is, withneither of the disks being over rolled with respect to the other. Shouldit be found that the rolls as shown in FIGURE 6 are not properlyadjusted so that the upper disk, for example, tends to be reduced morethan the lower disk, as would be indicated were the top disk to attain alarger diameter during forming than the lower disk, the operator needmerely to adjust the left hand set of rolls to provide the necessaryincreased roll opening for the rolls 82a and 83a. This increased openingwill decrease the unit rolling pressure applied to the upper re ducingroll 82a so that there will be a decreased reduction of the upper disk.This adjustment is made to balance the reduction of the two disks andthe finished diameters will be the same. While there is shown in FIGURE6 to be a marked contrast between the contours of the rollsdesignatedSZa and 82b and those designated as anvil rolls 83a and 83brespectively, it has been found that such a great difference between thereducing and anvil rolls is not necessary for practicing the inventionherein disclosed It is sufiicient that the area of contact of the anvilrolls be but slightly greater than the area of contact of the reducingrolls so that the roll having the greater area of contact will alwaysserve as a positive anvil and the roll of lesser area as the reducingroll. 1

With reference to FIGURE 5, showing three positions of two pairs ofsimilar rolls 61b and 62b, the rolls during a reducing operation contactthe disks at the first reducing position R R the portion of the roll a-bnot as yet making contact. As the rolls are withdrawn outward, one ofthe positions attained is that indicated at R 11 shown in-wull lines.During the time the rolls move from position R R to position R R aportion of the disks has already been reduced without actually beingrolled as is apparent when the disk portions indicated in dotted linesare compared with the corresponding disk portions as indicated in fulllines. Up to position R R three operations have actually been performedupon the disks namely; reduction due to rolling by the roll portion b-c,re-

duction due to elongation caused by the restraining or' confining actionat the edges of the disks between the roll portions c-d and burnishingof the rolled disk by the roll portion indicated at a-b.

After the rolls have reached'their positions onthe disks as shown in dotand dash lines, the reducing operation is then completed. The nextimmediate step is to open the reducing rolls so that on furtherwithdrawal of the rolls outward of the disks the rolls will not contactthe extreme edges thereby preventing workhardening of the disk edgeportions.

With respect to the modified form of reducing rolls as shown in FIGURE6, reduction by rolling takes place on the diagonally opposite sideinasmuch as each pair of rolls comprises a reducing roll 82a and adiagonally opposite reducing roll 82b and an anvil roll 83a and adiagonally opposite anvil roll 3312 respectively. Reduction of the disksby these rolls is very readily controlled for if it should be found thatthe disks do not have the same thickness at corresponding pointsradially outward of their centers merely by adjusting the pair of rollswhich produces the off-dimension disk, the taper of both disks will bemade uniform by reason of the controlled balanced condition thuseffected during the reducing operation. Thus byemploying rolls havingthe characteristics as outlined and due to the controlled conditionsobtainable, blanks of a minimum diameter may be used-to obtain therequired size of finished disk which would not otherwise be the case ifover rolling of one disk relative to the other should normally takeplace. If one disk should over roll the other, it is obvious that largerblanks would have to be supplied in order that the diameter of thefinished disks will be at least of the diameter required. Where thisprecaution must be taken, a considerable waste of metal is the result.

With reference to drawing FIGURE 7, there is illustrated therein onepair of two pairs of reducing rolls which have been further modified toincorporate some of the features of the rolls shown in both FIGURES 5and 6. Both rolls 84b and 35b include a lead-in portion d'e'f similar tothe lead-in portion def of rolls 61b and 62!: illustrated in FIGURE 5.However, roll 84b is provided with a rather short portion a'b' therebyconstituting the roll 84b the reducing roll whereas roll 85b is providedwith a rather long portion a"b" thereby constituting that roll the anvilor supporting roll. Although the other pair of rolls is not shown, it isto be understood that that pair is inverted with respect to the positionof the rolls 84b and 8517. As in the case of the rolls of FIGURE 6, therolls shown inFIGURE 7 will reduce disks accurately and uniformly as idone by adjusting the rolls in a fashion similar to that for the rolls82a, 83a, 82b and 83b shown in FIGURE 6. However, when the disks arerestrained and prevented from curling in the confining lead-in portionfrom c outward, the unrolled portion of the disks will be elongated in afashion similar to that which takes place with respect to the rolls 61band 62b shown in FIGURE 5. Thus, by this modification, controlledrolling obtainable by employing reducing and anvil rolls is supplementedby the additional advantage of avoiding over rolling of the disk areaadjacent to the edges. Although the drawings for purposes ofillustration show a pair of blanks'as being simultaneously processed inthe mill disclosed herein, it is to be appreciated that the apparatusmay be employed for processing one or more disks at the same time.

In accordance with the provisions of the patent statutes, I haveexplained the principle and operation of my invention and haveillustrated and described what I consider to represent the bestembodiment thereof. However, I desire to have it understood that withinthe scope of the appended claims, the invention may be practicedotherwise than as specifically illustrated and described.

I claim:

1. A pair of opposed cooperating rotatable rolls which form a disk froma blank of a substantially uniform thickness, said pair of rolls eachhaving corresponding opposed relatively constant diameter portionsadjacent to one end thereof for reducing said blank by a rollingoperation be ginning at an inner portion of the blank and Workingoutwardly, and at least one roll of said pair having an elongated secondportion extending toward the opposite end of said roll, said elongatedsecond portion being relieved away from said blank an amount greaterthan the distance between the opposed reducing portions of the rolls,and en-gageable by a portion of the blank outwardly of the portionthereof engaged by the rolling portions of said rolls, thereby causingelongation of the unrolled portion of the blank in advance of therolling thereof.

2. A pair of rolls according to claim 1 wherein at least said rollhaving said second portion has a relieved portion immediately adjacentthe inner edge of its second portion, said relieved portion being solocated as to tend to concentrate the rolling action to the rollingportion of said roll.

3. A pair of rolls according to claim I wherein said elongated secondportion of said roll is slightly smaller in diameter than therollingportion thereof and of a length suificient to engage a greaterarea of said blank than engaged by said rolling portion atthe'commencing of the rolling of said blank.

4. A roll for use in reducing a disk of a substantially uniform thicknesto form a disk of a given contour including a rolling portion forcontacting and reducing said disk, 2. burnishing portion for contactingand burnishing the portion of said disk previously reduced 'by rollingand a confining portion for confining and elongating a pert1on of saiddisk in advance of the portion reduced by rolling. i

5. A pair of opposed cooperating rotatable rolls for use in reducing ablank of a substantially uniform thickness to produce a disk of a givencontour, one of said rolls being a supporting roll having an elongatedblank contacting surface at its one end for contacting and supportingsaid blank from one side in areas progressively outwardly in a radialdirection, and the other of said rolls having a convex blank rollingportion at its one end for contacting said blank on the side oppositesaid supporting roll and directly back of the area progressivelysupported by said first-mentioned roll, at least one of said rollshaving a portion of progressively decreasing diameter of an amountgreater than the distance between the reducing portion and thesupporting portion of the said rolls, said portion of said one rollextending toward the opposite end thereof, and engageable, by a portionof the blank outwardly of the portion thereof engaged by said supportingsurface and said convex portion, thereby causing elongation of theunrolled portion of the blank in advance of the rolling portion thereof.

6. A pair of opposed cooperating rotatable rolls for formingsimultaneously a pair of disks from a pair of blanks of a substantiallyuniform thickness, said pair of rolls each having a section adjacent oneend thereof for reducing one of said blanks by a rolling operationbeginning at the inner portions of the blanks and working outwardlythereof, at least a portion of each said section having a relativelyconstant diameter, each of said rolls having an elongated second sectionrelieved away from one -of said blanks an amount measured from thereducing portion of the other roll greater than the thickness of saidblanks, and each elongated second section being engageable by a portionof one of the blanks outwardly of the portion thereof engaged by therolling sections of said rolls, thereby causing elongation of theunrolled portion of the blanks in advance of the rolling there-of.

7. A pair of opposed cooperating rotatable rolls for forming a disk froma blank of a substantially uniform thickness, said pair of rolls eachhaving a first opposed portion adjacent to one end thereof for reducingsaid blank by a rolling operation beginning at an inner portion of theblank and working outwardly thereof, at least one roll having anelongated second portion extending toward the opposite end of said roll,said elongated second portion being relieved away from said blank anamount greater than the distance between the opposed reducing portion ofthe rolls, and engageable by a portion of the blank outwardly of theportion thereof engaged by the rolling portions of said rolls, therebycausing elongation of the unrolled portion of the blank in advance ofthe rolling thereof, said roll having said second portion including arecessed portion arranged intermediate said rolling portion and saidsecond portion.

References Cited by the Examiner UNITED STATES PATENTS CHARLES W.LANHAM, Primary Examiner.

1. A PAIR OF OPPOSED COOPERATING ROTATABLE ROLLS WHICH FORM A DISK FROMA BLANK OF A SUBSTANTIALLY UNIFORM THICKNESS, SAID PAIR OF ROLLS EACHHAVING CORRESPONDING OPPOSED RELATIVELY CONSTANT DIAMETER PORTIONSADJACENT TO ONE END THEREOF FOR REDUCING SAID BLANK BY A ROLLINGOPERATION BEGINNING AT AN INNER PORTION OF THE BLANK AND WORKINGOUTWARDLY, AND AT LEAST ONE ROLL OF SAID PAIR HAVING AN ELONGATED SECONDPORTION EXTENDING TOWARD THE OPPOSITE END OF SAID ROLL, SAID ELONGATEDSECOND PORTION BEING RELIEVED AWAY FROM SAID BLANK AN AMOUNT GREATERTHAN THE DISTANCE BETWEEN THE OPPOSED REDUCING PORTIONS OF THE ROLLS,AND ENGAGEABLE BY A PORTION OF THE BLANK OUTWARDLY OF THE PORTIONTHEREOF ENGAGED BY THE ROLLING PORTIONS OF SAID ROLLS, THEREBY CAUSINGELONGATION OF THE UNROLLED PORTION OF THE BLANK IN ADVANCE OF THEROLLING THEREOF.